function hello()
{
  echo "hello, world!"
}

function tell_who_i_am()
{
  echo $(whoami)
}

function which_distro_do_i_use() 
{
  echo $(cat /etc/os-release | grep ^NAME)    
}

function view_my_cpu_arch() 
{
  echo $(uname -m)
}

function show_first_scsi_disk_size() 
{
  echo $(lsblk -l | \grep disk | \grep '^sda ' |awk '{print $4}')
}

function show_main_memory_size_in_megabytes()
{
  echo $(free -m |grep "Mem:" |awk '{print $2}')
}
